Re: [CAD_CAM_EDM_DRO] Captain Nema Nemo

info.host@... wrote:

> Hello,
>
> I have found a few triple phase 415V static converters, they're about
> £250 - 300 for the HP range I'm looking at. I have found some 2 pole single
> phase motors for much less with RPM's of 3000 and 1500 on 4 pole. This is
> for the Beaver VBRP, I don't have triple phase and the guy's not sure if the
> motors even work. I'm wondering if it's worth buying a static converter if
> they do or if I'd be better just saving myself some money and getting single
> phase. I know triple phase runs smoother but is twice the cost really worth
> it? Especially after the beating the motors will have taken over the years.
>
> The spindle motor won't be specifically made only for the Beaver will
> it? It appears to be face plate mounted, I should be able to replace it with
> another standard Nema sized motor shouldn't I? There are some pictures in
> the Photo's section. A few more things, I could wire brush the table back to
> a nice clean finish but would it be acceptable to bring the table back into
> good backlash settings and then pass a fly cutter over the table to skim a
> small layer off and level the table again? Or would that be too risky and
> fill the table with unevenities? I bet you're going to say it wouldn't reach
> to the end bit of the table. : )
>
> I have £842.90 in my bank account - £450 for the mill = £392.90
> £392.90 - £23.44 for a starter - £88.07 2hp 2 pole 3000rpm motor = £281.39
> for simple tooling and cosmetic bits, possibly a cheap coolant system from
> an Enco like joint

Don't do it this way. This is the OLD way.

What you want is a VFD (Variable Frequency Drive). With this, you will
not need the motor starter or the phase converter. 3 Phase motors are
usually cheaper than single phase, and also generally perform better.
The VFD can be used to convert from single to 3-phase power. Some
claim to require 3-phase input, but practically all VFDs made since the
mid-80s will run on single phase with some derating. (Most of these
units are already designed very conservatively, so that they can run
at 50+C in still air.

Fly cutting the table is not a bad idea, especially if it shows a lot of
dings, etc. You might have to do it in sections, if the head swivels
like on a Bridgeport.

Jon